Telephone-exchange system.



J. N. REYNOLDS. TELEPHONE EXCHANGE SYSTEM. AIPILIOATION IILIED JULY 8,1911.

2 anus-sum 1.

Dim

. (nven/or: Jo/m' /V. Reyna/d5.-

Patented Apr.15, 1913.

S %MJA y J. N. REYNOLDS. TELEPHONE EXCHANGE SYSTEM.

A PPLIOAT ION FILED JULY 8, 1911.

Patented Apr. 15,1913.

. 2 SHEETS-SHEET 2.

man? a I lllill UNITED STATES PATENT oEEIoE.

JOHN NEWBERRY nnYNoLns,

, ELECTRIC COMPANY, OF

or GREENWICH, CONNEcTIcUT; AssIGNon T0 WESTERN NEW YORK, N. Y., ACORPORATION or ILLINOIS.

TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Apr. 15, 1913.

Application filed July 8, 1911. Serial No. 637,435.

Te-ell whom it may concern Be it known that I, JOHN NEWBERRY R Y- NoLos,citizen of the United States, residing at Greenwich, in the county ofFairfield and State of Connecticut, have invented a certain new anduseful Improvement in Telephone-Exchange Systems, of which the followingis a full, clear, concise, and exact description.

This invention relates to switch control-' ling systems and has for itsobject to provide a controlling circuit for revertive control powerdriven automatic switches such as are used in telephone exchange systemsof the full automatic or semi-automatic type. It has been foundparticularly useful in automatic switches of the panel type in which aninterrupter or commutator is associated with the switch, and sends backto the controller or sender an impulse for each pendently making andbreaking said circuit.

I which the'ca'll desired A circuit for initially energizing said relaymay be under the control of a sender, upon is registered, and soarranged as to be closed only when the sender is set', and opened againupon its return to normal. Preferably both the power applying circuitand the looking or shunt circuit are controlled at a front contact ofsaid relay. Theinterrupter may be in the form of a commutator segmentwith its arm supported and moving with the brush rod for acompletedisclosure of which reference is made to my copendingapplication, No. 637,43 L'filed July 8, 1911. During unit selection theadvantage gained by this arrangement is that when the commutator arm'leaves the commutator segment corresponding to'the desired lineterminal, and in so doing opens the shunt circuit, the power applyingrelay is rendered inert, since the alternative circuit-the line circuitwas opened at-the sender immediately upon the latters return to normal.Further, since the shunt circuit leads througha front con- Serial tactand armatureof said power applying relay, it cannot be completed againtoactuate said relay and cause it to complete the circuit for the powermagnet, iffor any reason the brush arm should again make contact with acommutator segment. 'This arrangement is also useful during the brushselecting range of the commutator to pre- 'vent the brush rod from'stoppingbelow a point where, a tooth of its holding rack will come intoengagement with its retaining pawl. It maintains the power magnetenergized after the commutator armpasses beyond a commutator segmentIncluded in the. lockuntil the locking circuit is opened ing circuit,andso arranged in relation to a the rack and pawl as to maintain the powerapplying relayclosed up to a point where a tooth will surely be engagedwhen the power circuit is broken.

Referring-to the drawings Figures 1 and 2 illustrate the controllingsystem of my in ventio-n, Fig. 1 representing the sending ap.. paratusor controller, and Fig. 2 theselector. l

controlled by such sender. The selector shown 1s capable of makingconnection w1th any one of five hundred lines and is controlled by asender having hundreds, tens and units registers. The depresslon of akey of each of the registers grounds corresponding contact po nts and M,M and M and causes the respective finder brushes to move directly andrapidly to the grounded point Where they are stopped abruptly and withprecision by the energization of the respective magnets 12, 12 and 12opening the respective driving circuits at 5, 5 and 5 The call thusstored up is made eifective to govern; the travel of the distantselector by causing itsarm'to trayel in synchronism closes circuitsthrough the motor niagnetsof the respective registers withthe successiverestoring movements of the finder brushes. The local controllingcircuits at the sender and selector, which must be established indefinite orderat successive stagesof the operation to bring into servicethe diiferent devices and parts as they are required, are established byautomatic switch a pliances known as sequence switches, there eingonefor the sender and one for the selector.- Such a device is illustratedin British patent to McBerty No. 20,839 of 1909, and in the presentshowing the switch springs of the sequence switches desired line,performing the requisite in-- are not shown in their actual arrangement,but are so located as to give the clearest arrangenient of Circuits. Thepositions of the rotary element of each sequence switch in which any ofits'contacts are closed are indicated by the numbers placed adjacentsuch contacts, each contact being open in all positionsexcept thoseindicated by the adjacent numbers." Each sequence switch has a specialcontact governing the local or locking circuit of its motor magnet, suchas contacts 175, 176, these contacts being closed while the rotaryelement of the sequence switch is in transit from one stopping positionto-the next to insure that it will take the full movement and not stopin intermediate positions. Instead of designating the closed positionsof the special contacts 17 5, 1? 6 of the sender and selector sequenceswitches, re-

spectively, the open positions are indicated and are placed on theoppositeside of the contactsinstcad otadjace'nt- -th'em'a s in the othersequence switch contacts. The special contact 175 of the sender sequenceswitch has no positions to run through without stopping, and merelyserves to prevent the switch stopping between positions. For conveniencein tracingthe circuits separate batteries are shown at various points,but it will be understood thatthese may, and where located in the sameexchange would, in practice be oneand the some battery.

The organization and mode of operation of the system will prob-ably bebest understood by tracing the successive steps involved in causing theselector to connect with a cidental operations, and finally restoringthe circuits. and apparatus to normal. The operator will store up thecall on the sender by depressing the necessary keys of the hundreds,tens and units registers, representing the digits of the wanted line.The depression of. the hundreds key grounds conductor 9 connected withthe contact 10 corresponding to the depressed key of the hun- 'dredsregister, and completes a circuit from ground 2, contact 3 of thedepressed hundreds key, conductor 4, contact 5, conductor 6, moto-rmagnet M to battery 8. The completion of the second circuit energizesthe motor magnet M of the hundreds register and causes segmental rack11. tobe driven.

forwarduntil its arm 12 strikes the contact 10 which has been grounded,when a circuit is vlosed-trom battery 13 through the stop magnet 12 toground at 2, through contacts 3 of the depressed hundreds key. Thisoperation (lisplaces the hundreds register fro normal corresponding tothe vole-- pressed at in" similar manner the tens and units registersare each displaced the desired number of steps from their normalpositions, thus placing the sending apparatus in readiness forcompleting the desired connection. The key 14 may then be depressed tostartselection.

Depressing the key 14 completes a circuit from ground 15 through wire 10and relay 17 to battery 18. Relay 17 operates, allowing current to flowfrom battery 18 through contact 19, sequence switch contact 20, wire 21to sequence switch clutch 22 and. ground The sequence switch takes onestep from its normal position to position 1 where contact 20 is opened,and contact 233 closed to complete a circuit from ground 24 of the unitsregister, ofi' normal contacts 25, (closed when the register isdisplaced) Wire 26, wire 27, tons register ofi. normal contact 28, wire29, hundreds register off normal contact 30, wire 31, sequence-switchcontact 23, wire 32, stop relay 33 to battery 34. Stop relay 33 nowoperates, closing front contact 35, which completes the circuit fromground 36, stepping relay 37, wire 38, contact 35, wire 57, wire 101(Fig. 2), sequence switch contact 102, line relay 103 to battery 148.The closure of front contact 50' of relay 33 closes a circuit fromhattery 34, said contact, sender sequencejswitch contact 51, sendersequence switch motor magnet 22 to ground and the sender sequence switchmoves to-position 2. The closure of the circuit including battery 148and relay 103 causes the hundreds register to take its first half steptoward the normal position when relay 37 in operating completes acircuit from ground 36, contact 40, sequehce switch contact 41, wire 42,stepping magnet 43 of the hundreds register to battery 44. At the sametime relay 103 is operated to move the raises the selector rod 177 andthe coni inutator bras-r116 intermittently closes andopens a shortcircuit around controller stepping relay 37- through the followingcircuit: ground 117, selector sequence switch contact- 118, wire 110-,commutator contact plate 120, brush 121, brush 116, contact plate 122,selector sequence switch contactv 123, wire 124, wire 125, relay 1.03 tobattery 148. Each time this shunt circuit is completed the steppingrelay 37 at the sender releases, and each time it is broken said relaypulls up, allowing the stepping mugnet 43 of the hundreds controller tooperate the pawl 45 to enable the spring 46 to bring the registermovement 11. a complete ,step back to'its normal position, for each makeand break of the shunt circuit. -Whei1': the last step is completed thelast half of I the sender arm 12 opens off-normal contact 30, thusbreaking the circuit through stop relay 33 and opening the circuit toselector line relay 103.

Although the operation of the low speed clutch is started by acircuit toground 104' through contact 106 of relay 103, it is not continued inoperation by said circuit but by another whose connection to ground isindependent of relay 103. Therefore when 're lay 103 finally releasesafter the opening of the line circuit at contact 30, and opens thestarting circuit, the operation of the clutch is continued uninterruptedin position 2 over the other circuit which is traced as follows: ground117, selector sequence switch contact 118, wire 119, commutator plate120, wire 148, selector sequence switch contactcontact 141,'

139, wire 138, sequence switch wire 145, clutch 146 to battery- 147 Whenrelay 103 released and closed its back contact 126 a circuit wascompleted from ground 104, contact 126, selector sequence switch contact127, shift magnet 128, to battery 129. The operation of the shift magnet128 twisted the selector rod 177 and caused its pin 178 to engage withthe desired set of brushes 17 9 during the upward travel of the rod. Thecircuit whichcaused the sequence switch to be driven to position 2 wasclosed when relay 103 released and is traced from contact 126 of saidrelay through Wire 130, sequence switch contact 131, wire 132, wire 109,selector sequence switch clutch 110 to battery 111. At position 2 theline relay 103 is again energized locally through the following circuit,the selector sequence switch contact 102 in the circuit to the senderbeing open: sequence switch contact 118, wire 119, commutator plate 120,comutator brush 121, commutator brush 134, commutator plate. 135, wire136, selector sequence switch contact 133, wire 124, wire 125, relay103, to; battery 148. The result of the closure of this circuit is toclose at front contact 106 of relay 103 a circuit to advance thesequence switch to position 3. The ground at 117 therefore not onlycompletes a local energizing circuit for relay 103, but also serves tomaintain the clutch magnet 1 46 energized during the entire brushselecting range of the commutator so that any desired brush may beseized without interrupting the movement of the brush rod. If nov othervground for the circuit of the clutch magnetwere provided than that underthe control of relay 103, the clutch magnet would become deenergized assoon as the desired brush was selected and relay 103 deenergized, bytheopening of its circuit upon the return to nor, mal of the hundredsregister. At position 3, however, this ground 11'? is removed by rack181 will clear theend of the brush selecting movement or the opening ofsequenceswitch contact 118,

ground for the remainder of the movement cf the rod over the brushsection 122 being "supplied by the front contact of relay 103, wire 138,sequence switch contact 139, wire l48', commutator plate 120, brush121', brush 134, com1nutator plate 135, wire 136, selector sequenceswitch contact 133, wire 124, wire 125, relay103 to battery 148. Thislocking circuit insures that the first tooth 142 of the the holding pawl180 at range and not allow the brush rod to fall down when the power iscut off, since the relay 103 will be held up until the brush 134 leavescommutator plate 135, the end of which correspondswith the location ofthe first tooth 142 on theirack 181. Returning to the controller Fig. 1,it will be seen that when stop relay 33 releases, contact 50 is closedcompleting the following circuit: battery 34, relay contact 50, sendersequence switch contact 51, wire 52 to sequence switch clutch 22 andground 53. Thisa vances the switch to position 3 for tens selection.vThe switch is stopped at position 3 by the operation of stop relay 33 asfollows: battery 34, relay 33, wire 32, sender sequence switch contact54, wire 29, off-normal contact 28 of the tens register, mal, contact 25ground 24.-

When the brush rod has reached the end of the brush range, relay 103 isreleased by the opening of the locking circuit referred of the unitsregister to to, and its back contact 126 moves the sequenceswitch toposition 4. At position4 wire 27, wire 26, otf-nor-w the circuit to theregister is again closed through contact 102 and relay 103 again operated. The closing of its frontcontact causes the sequence switch tomove into position 5. Between positions 4 and 5 sequence switch contact140 is' momentarily operated to send a preliminary step to the tenscontroller. While this is taking place the selector sequence switch;continues its movement to position 6 where tens selection takes place.In case the 0' tens key has been de pressed (2'. ctn'o tens steps areto'be taken by the selector) the preliminary step bycontact'satisfies'the tens register, that is to say, a

' clrcuitis closed and opened from ground 36,

through sender sequence switch contact 42 to the step magnet 43 of thetens register, which restoressaid register to normal, since the zero keyhas been depressed and the arm 46 thereof rested on the/first contact10. The apparatus then proceeds to units selec tion. In case the. oneimpulse did not satisfy the tens registe'n however, at position 6- I ofthe selector sequence switch, relay. 103 will be held up with the resultthat current is supplied tothe high speed clutch 150 through sequence,switch contact 112, wire 113 to battery 115 and the high speedcomniutator brush134 in passing over the tens commutator contact plates152 intermittently short circuits relay 37 and causes the tens registerto he stepped back to its normal v .32, selectcnsequence switch contact55, wire position.

-When the tens register reaches normal position it opens the cit-normalcontact28, releasing relay 33, which in turn releases relay 103 atcontact 35. Relay 103 in releasing also releases the high speed clutch,and by means of its back contact 126, moves the sequence switch toposition 7 which is preparatory to units selection, At the sender whenrelay 33 releases at the end of tens selection the sequence switch ismoved to position 4; for units selection by the following circuit:battery 34, contact 50, sequence switch contact 51, wire 52, clutch 22to ground The switch is stopped at position; 4. when relay 33 operatesthrough the following circuit: battery 34, relay 33, wire 56,; wire 26,oif-iidrmal contactof th'e units register to ground 24. At. selectorswitch position 7 the circuit of relay 103 is again closed at the sendercontact 35, which advances the switch to position 8 for units selection,in which position the circuit of the low speed clutch 146 is closedthrough contact 106 of relay 103, and selector sequence switch contact141, and the brush rod 177 is again driven upward at low speed. Duringthis operation the commutator contact brush 116 and units commutatorplate 18% intermittently short circuit relay 37, as

' described before and the units register is operating magnet 37 wastransferred 106 of the line relay 103 and.

allowed to'step back to its normal position. It'will be remembered thatat the third position of thefselector sequence switch the con trol ofthe shunt circuit about the senderfront contact that the energizingcircuit for the clutch 146 also is controlled at the same contact. Wewill now examine the various relative positions of the commutator brush116, the

units commutator segment 184:, the linebrushes 7) and theircooperatingfixed terminals 2? during the process of a selection Thecommutator brushes are normally out of contact with the segments inorderto enable the sender operating relay 37 to be initially energizedto cause the hundreds register to take the first half step, since therelay 37 would not pull up upon the energization of the @relav 33 ifthis shunt were closed at this time. There must be of course a definiterelation between the commutator segments, the teeth of'thf'rack. thefixed line terminals and the fixedqholding pawl, there being necessarilya correspondence in number he tween the units commutator segments 1'84:

and the fixed line terminals. The commututor plate 13.3,which enablesacircuit to be closed to keep thebrush moving throughout the brushrange, is arranged in such relation to the fixed pawl and the teeth inthe rack that when the brush 13 i clears its end, or in other wordspasses out of the brush-selectin range, the first or top tooth upon .therack 142 will have passed the fixed pawl 180, and since the line circuitby which the relay 103 was initially energized was opened when the arm12 of the hundreds register had opened the ofi-normal contact 30 uponits final movement, the shunt circuit controlling the circuit of theelevating clutch 1. 16 is opened the instant the brush 134 leaves thesegment 135. The rod 177 then settles back until the pawl 180 reachesthe bottom of the notch between teeth 1412 and 1 13, in which positionthe set of brushes selectc'd is one step below the first set of fixedterminals t. The low speed clutch alone, or the high and low-speedclutches alternately naythen be applied to continue the upward travel ofthe rod with its selected set of brushes 1), the relation betweentheun-its segments 18% of the conunutator and the teeth of the raclc-181being such that when the commutator brush 116 clears the segment correspmding to the. line tcrminals t predetermined by the setting of thesender, its corresponding tooth on the rack 181 has cleared the pawl 180and is held thereby, with the selected set of brushes 1) in contact withthe desired fixed terminals t. For various reasons, among which may bementioned mechanical imperfections and th necessarily slight separationof the commutator segments 18t,-whcn the brush rod settles back thecommutator brush 116 would in practice occasionally again contact withthe corresponding units segment 184; which when it lett caused theopening of the shunt circuit and the consequent dcenergization of theline relay which through its front contactclosed the circuit of thepower applying magnet 147, and therefore since this front contact openswhen such decnergization occurs, this powcr-applying shunt circuitcannot again become closed when said brush falls back and comes intocontact with the segment it left. or if haying enough inertia with theone above. Another advantage of this arrangement is that the selected oibrushes may be driven upward at as low :1 speed as desired withoutdanger of underselecting. that is, of selecting the set of lin terminalsbelow the one dcsired, this being due to the holding up of the linerelay 103 by the shunt circuit after the alternative circuit to thesender has been opened. \Yhcn relay 103 released, its back contact 126COlllpleted the circuit to the sequence switch clutch, which advancedthe sequence switch r the pawl 180 and the To restore the selector toits normal posit-ion key 14 is released, which opens the circuit throughrelay 17. The back contact 61 of this relay restores the controllersequence switch to its normal position, and contact 62 completes acircuit from ground 18, wire 63, wire 1S8, selector sequence switchcontact 143 to clutch 110 causing it to move 'to position 10, inwhich acircuit is closed from battery 129 through release magnet 182, selectorsequence switch contact 185 to ground, which causes said magnet throughthe lever 186 and rack 181 to twist the rod 177 and cause the engagedtooth to slide off pin 178 to be disengaged from the brush 179 andthey-both drop back to normal, the descent being periodically checked bycuit through the low-speed clutch 146 from battery 147, the magnet ofsaid clutch, selector sequence switch contact 189, vibrator 190 toearth. hen the brush 134 reaches the commutator segment, with which itis shown in contact, a circuit is closed from battery 111 of theselector sequence switch motor magnet 110, sequence switch contact 187,the said commutator segment, brush 134, brush 121, segment 120,conductor 119, sequence switch contact 118 to ground 117, and thesequence switch moves on to normal position. The mechanism is now freeto establish another connection.

Vhile the invention is particularly useful in selecting telephone lineterminals in automatic or semi-automatic telephone exchanges, it may ofcourse, be employed wherever it is desired to select one of a num-' berof grouped circuit terminals.

1. The combination with a*selec tor, a motor-magnet therefor, a relayfor controlling the circuit of said magnet, a line circuit, a sender, anoperating magnet therefor in said line circuit, a contact in said linecircuit controlled by said sender, a commutator and arm associated withsaid selector for closing a shunt path about said sender operatingmagnet to intermittently actuate the sender, and a contact in said shuntpath controlled by said relay.

2. The combination with a line circuit, a sender, its operating relay,said sender being adapted to close the line circuit through anintermittent c-irsaid relay, a selector, a line relay at said selectorenergized by the closure of said line circuit, a motor-magnet for saidselector energized by said line relay upon the closure of said-linecircuit, a commutator and its arm, and a, shunt circuit about saidsender controlled at a front contact of said'line relay, said shuntbeing intermittently closed by said commutator and arm to actuate saidsender operating relay.

3. The combination with a line circuit, a Sender adapted to close. thesame when displaced, a panel selecto and its brush, a relay energized bythe closure of said line circuit, a motorvmagnet for driving said brush,a circuit for said motor-magnet and a shunt circuit abdiltsaid senderboth controlled at a front contactof said relay, and a com1nutator andarm for intermittently closing said shunt when said relay is energizedand said brush moved, permitting; the restoration of said sender to opensaid line circuit.

4. The combination with a line circuit, a

sender adapted to close the same when displaced, a selector, a relayenergized by the closure of said circuit, a motor-magnetfor saidselector, a circuit therefor closed at a front contact of said relayupon the closure of said line circuit, and ashunt circuit about saidsender including said relay and its front contact, and a commutator andarm adapted to intermittently open said shunt circuit to permit therestoration of said sender which thereupon opens said line circuit,whereby the next opening of the shunt circuit by the commutator and armde'e'nergizes said relay,

5. The combination with aselector provided with an interrupter, of acontrolling circuit, and an operating circuit for the selector, and arelay for controlling said operating circuit having a contact andarmature included in said controlling :ircuit in series with saidinterrupter whereby said relav effects a change in one of said circuitssimultaneously with a change in the other of said circuits.

In witness whereof, I hereunto subscribe my name this seventh day ofJuly A. 1)., 1911.

JOHN NEW' BERRY REYNOLDS. \Vitnesses:

IRVING Mac Donna), FRANK A. Fnu scrnmn.

Copies of this patent may be obtained for five cents each, by addressingthe Commissibner of Patents,

-Washington, D. 0.

